onchange doesn't work in IE

[gabriela88]

For our website we have a reservation form.
When the user clicks on the radiobutton "yes" the rest of the form should appear. In FF and in Safari it works fine, but in IE it doesn't show.


headcode javascript:

function activate_luchthaven_retour(){
				var checkdiv = document.getElementById('bestemming_luchthaven_radio_ja');
				var retourdiv = document.getElementById('bestemming_luchthaven_retourja');
				if(checkdiv.checked == true){
					retourdiv.style.display = 'block';
				} else{
					retourdiv.style.display = 'none';
				}
			}

Code inside the body

<td class="labeltd">Retour rit?</td>
												<td class="datatd">
													<input type="radio" name="bestemming_luchthaven_retour_radio" value="Ja" id="bestemming_luchthaven_radio_ja" onchange="activate_luchthaven_retour();"/>Ja
													<input type="radio" name="bestemming_luchthaven_retour_radio" value="Nee" id="bestemming_luchthaven_radio_nee" checked onchange="activate_luchthaven_retour();"/>Nee 
												</td>
											</tr>
										</table>
										<table cellspacing="0" cellpadding="0" id="bestemming_luchthaven_retourja" class="innerTable" style="display:none;">
											<tr>
												<td class="labeltd">Retour vluchtnummer:<span class="form_require_star">*</span></td>
												<td class="datatd"><input type="text" name="retour_luchthaven_lijnnr" id="retour_luchthaven_lijnnr" value="" /></td>
											</tr>
											<tr>
												<td class="labeltd">Retour Datum/Tijd:<span class="form_require_star">*</span></td>
												<td class="datatd">
													<span style="background-image:url(images/calendar_btn.png);background-repeat:no-repeat;margin:2px 0 0 0;float:left;cursor:pointer;width:20px;height:20px;display:block;" id="retour_datetime_btn"></span>
													<input id="retour_datetime" name="retour_datetime" />
													<script type="text/javascript">//<![CDATA[
														Calendar.setup({
															animation: false,
															inputField: "retour_datetime",
															trigger: "retour_datetime_btn",
															onSelect: function(){ this.hide(); $("#retour_datetime").valid(); },
															showTime: true,
															noScroll: true,
															dateFormat: "%d/%m/%Y %H:%M"
														});
													//]]></script>

This is not all of the code ofcourse

[gabriela88]

In this case "yes" is "ja".
I hope anyone can understand this post since some of the used terms are written in Dutch.

[Dormilich]

change the onchange to onclick (despite that is makes more sense anyways). IE has some known problems with onchange and radio buttons/checkboxes.